<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>padding不会影响盒子大小的情况</title>
    <style>
        h1 {
            height: 200px;
            background-color: aqua;
            padding: 30px;
        }

        div {
            width: 300px;
            height: 100px;
            background-color: blueviolet;
        }

        div p {

            padding: 30px;
            background-color: aquamarine;
        }
    </style>
</head>

<body>
    <h1></h1>
    <div>
        <p>
            哪怕数值是100%也会撑开盒子
        </p>
    </div>
    <img src="img/padding不影响情况.png" alt="">
</body>

</html>